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MAME includes a command-line tool called chdman. In version 0.240, no structural changes were made to the CHD format, so you can safely use CHDs from earlier versions (back to 0.236) without conversion.
To verify a CHD:
chdman verify -i "game.chd"
To extract a CHD to raw format (for use in other emulators): mame roms set 0240
chdman extracthd -i "game.chd" -o "game.bin"
MAME 0.240 was released in December 2021. In the world of arcade emulation, MAME (Multiple Arcade Machine Emulator) is the gold standard, and specific version numbers are critical because the emulator is constantly evolving.
A "ROM set" is a collection of the game data files required to run games on a specific version of the MAME emulator. Because the MAME developers frequently rename files, reorganize folder structures, and fix errors, a ROM set for version 0.240 will not work correctly on older or newer versions of the emulator. MAME includes a command-line tool called chdman
The MAME project and its ROMs have had a significant impact on the gaming community. They preserve gaming history, allowing new generations to experience and appreciate classic games. The project also serves as a technical challenge, pushing the boundaries of emulation technology.
If you want to move from 0.240 to a newer version: To extract a CHD to raw format (for
This document describes MAME ROM set 0240: what it contains, major changes from previous sets, compatibility notes, and guidance for collectors and preservationists.
After downloading, you must verify the set. MAME is picky about checksums. The tool of choice is ClrMAMEPro.